Starfox is such a C lister that I can't see that happening. Again to me the whole Pym deal should have been here and axed Black Widow and Hawkeye...then they could have added Vision and Wonder Man...
Starfox's deal has always been his tie-in with Thanos, without a doubt. Without that link he's not that interesting of a character. But the introduction of Thor has brought with it the concept of super-powered aliens.
The Ant Man movie may eventually lead to some sort of involvement with the Avengers down the line. Although that's slated for 2014. Will that be enough time before another installment of Avengers?
Well, Iron Man 3 is slated for 2013, and that's already shaping up to be interesting. Captain America 2 & Thor 2 are both slated for 2014. And there's also a new Hulk movie in development with Mark Ruffalo signed for the role. With that kind of schedule, you've got to think that Avengers 2 could be about 3 years out at the very least.